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JaCoCo is an open-source toolkit for measuring and reporting Java code coverage. JaCoCo is distributed under the terms of the Eclipse Public License. It was developed as a replacement for EMMA,cite-ref-jacocomission-1-0[1] under the umbrella of the EclEmma plug-in for Eclipse.

JaCoCo offers instructions, line and branch coverage.

In contrast to Atlassian Clover and OpenClover, which require instrumenting the source code, JaCoCo can instrument Java bytecode using two different approaches:

• like JCov on the fly while running the code with a Java agentcite-ref-2[2]

• like Cobertura and JCov prior to execution (offline)

And can be configured to store the collected data in a file, or send it via TCP. Files from multiple runs or code parts can be merged easily.cite-ref-3[3] Unlike Cobertura and EMMA it fully supports Java 7, Java 8,cite-ref-idea-4-0[4] Java 9, Java 10, Java 11, Java 12, Java 13, Java 14, Java 15, Java 16, Java 17, Java 18, Java 19 and Java 20.

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